WARNINGBatteries present a risk of electrical shock or burn from high short-circuit current.Obey proper precautions.Electric energy hazard. Do not attempt to alter any battery wiring or connectors.Attempting to alter wiring can cause injury.Do not open or mutilate batteries. Released electrolyte may be toxic and isharmful to the skin and eyes.Batteries may contain HIGH VOLTAGES, and CORROSIVE, TOXIC andEXPLOSIVE substances. Because of the battery string the output receptaclesmay carry high voltage even when the AC supply is not connected to the UPS.Read the shutdown instructions carefully.IMPORTANT: The battery may consist of multiple parallel strings. Make surethat you disconnect all strings before installation.CAUTIONOnly qualified service personnel knowledgeable of batteries and the requiredprecautions are allowed to perform installation or service work on batteries.Keep unauthorized personnel away from the batteries. Before you install orreplace batteries, consider all the warnings, cautions, and notes concerningappropriate handling. Do not disconnect the batteries when the UPS is in theBattery mode.Make sure that your replacement batteries are of the same number and type asthe battery that was originally installed in the UPS. See more accurateinstructions on the UPS.Before you connect or disconnect battery terminals, disconnect the chargingsource by opening the corresponding battery circuit breaker.Examine if the battery is inadvertently grounded. If it is, remove the source ofthe ground. Contacting any part of a grounded battery can cause a risk ofelectric shock. If you disconnect the grounding connection before you work onthe batteries, the risk of an electric shock is less likely.Discard batteries according to your local disposal requirements. Do not disposeof batteries in a fire. When exposed to flame, batteries may explode.To reduce the risk of a fire, connect only to a circuit that has a circuit breakerthat is rated in accordance with the national and local installation rules and UPSinstallation instructions.To ensure proper cooling airflow and to protect personnel from dangerousvoltages inside the unit, keep the UPS door closed and the front panelsinstalled.Do not install or operate the UPS system close to gas or electric heat sources.Keep the operating environment within the parameters stated in this document.EATON 91PS/93PS UPS USER’S AND INSTALLATIONGUIDEP-164000672 - 005 2023 www.eaton.eu 1111